scholarly journals Mathematical Model for the Harmonic Analysis of Electric Arc Currents and Voltages in an Electric Arc Furnace

2021 ◽  
Vol 21 (2) ◽  
pp. 72-84
Keyword(s):  
Electric Arc ◽  
Control Algorithms ◽  
Electrical Parameters ◽  
Arc Furnaces ◽  
Unit Design ◽  
Initial Melting ◽  
Valve Effect ◽  
Voltage Harmonics ◽  
Late Stages ◽  
Even Harmonics

This paper analyzes how the relative effective total odd and even current and voltage harmonics of an electric arc in a furnace correlate with the thermal time constant of the arc, with the valve effect, and with the asymmetrical operation. The furnace circuit model was used to theorize upon the effectiveness of using even harmonics data to diagnose the charge melting stage during initial melting; and odd harmonics to analyze the late stages. The results of mathematical modeling helped draw guidelines for the design of the charge melting diagnosis unit to be part of the electrical parameters control system; the unit design depends on the furnace type. The results could be of use in research of better control algorithms for electric arc furnaces and lade furnaces with a focus on reducing the energy costs of producing molten steel.

The Valve Effect of an Electric ARC and Problems in Controlling Electric-ARC Furnaces

Metallurgist ◽  
2015 ◽  
Vol 59 (5-6) ◽  
pp. 380-385 ◽  
Author(s):  
A. V. Sivtsov ◽  
O. Yu. Sheshukov ◽  
M. M. Tsymbalist ◽  
I. V. Nekrasov ◽  
D. K. Egiazar’yan
Keyword(s):  
Electric Arc ◽  
Electric Arc Furnaces ◽  
Arc Furnaces ◽  
Valve Effect

scholarly journals Metal Oxidation Control at the Stage of Refining Steel Smelting in Electric Arc Furnaces

2020 ◽  
Author(s):  
Sivtsov A.V. ◽  
Sheshukov O.Yu. ◽  
Tsymbalist M.M. ◽  
Nekrasov I.V. ◽  
Egiazaryan D.K.
Keyword(s):  
Oxidation Process ◽  
Rapid Assessment ◽  
Electric Arc ◽  
Slag Formation ◽  
Metal Oxidation ◽  
Electrical Parameters ◽  
Arc Furnaces ◽  
Refining Steel ◽  
Electric Parameters ◽  
Mathematical Processing

The mathematical processing results of a number of EAF-135 melts electrical parameters are presented. The influence of the foamy slag formation, molten metal carburization and the harmful impurities oxidation on the change in electrical parameters is analyzed. The methodology for determining the metal oxidation from the electrical melt parameters is characterized. In the presented form, the technique is cumbersome for the rapid assessment of the oxidation process intensity and requires refinement. Keywords: Metal oxidation, electric parameters, electric arc furnace

Improving the efficiency of electric arc furnaces through improved control algorithms for electrical modes

2020 ◽  
pp. 10-16
Author(s):  
A. A. Nikolaev ◽  
◽  
G. P. Kornilov ◽  
P. G. Tulupov ◽  
G. V. Nikiforov ◽  
...  
Keyword(s):  
Short Circuit ◽  
Unit Cost ◽  
High Energy ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Control Algorithms ◽  
Separate Analysis ◽  
Arc Furnace ◽  
Electric Arc Furnaces ◽  
Arc Furnaces

The aim of this study is to increase the efficiency of electric arc furnace through the use of advanced control algorithms for electrical modes. It was established that despite the common structure of the electric control system, as well as the approach to diagnosing the stage of the technological process, the criteria for switching from one combination of the furnace transformer tap and operating curve to another for electric arc furnaces and ladle furnaces are different. So, for EAF it is advisable to use a system in which a separate analysis of the signals of the relative effective value of the total even and odd harmonics of electric arc current (voltage) should be applied. It’s important to note that at the initial stage of melting it’s preferable to use even harmonics, and at the final stage of melting - odd harmonics. In it’s turn, during melting in LF, the argon blow mode and the slag mode have a significant role. Intensive blowing modes lead to the appearance of a metal mirror with the occurrence of bursts that occure short-circuit of the electric arc and lead to not optimal electric mode. According to the results of the analysis, a number of recommendations have been formulated that can have practical application in modernizing of modern control systems, aimed at optimizing production energy costs and reducing the unit cost of the final product of the metallurgical cycle. Moreover, the experience of implementing the described ides shows (for shaft-type electric arc furnace with capacity 125 ton, 85 MVA and ladle furnace 25 MVA) that the economic effect is 2.5% in terms of saving electric energy and 2% in terms of saving the consumption of electrodes. It’s a significant indicator taking into account the high energy intensity of modern electric steelmaking shops. This work was supported by the Ministry of Science and Higher Education of the Russian Federation (project No. FZRU-2020-0011).

Predicting the Power Consumption during Furnace Charge Melting in Steelmaking Electric Arc Furnaces

Vestnik MEI ◽  
2019 ◽  
Vol 6 ◽  
pp. 83-90
Author(s):  
Anatoliy M. Kruchinin ◽  
◽  
Mikhail Ya. Pogrebisskiy ◽  
Elena S. Ryazanova ◽  
Andrey Yu. Chursin ◽  
...  
Keyword(s):  
Power Consumption ◽  
Electric Arc ◽  
Furnace Charge ◽  
Electric Arc Furnaces ◽  
Arc Furnaces

Virtual Analyzer of the Voltage and Current Spectrum of the Electric Arc in Electric Arc Furnaces

2021 ◽  
Vol 2021 (6) ◽  
pp. 713-719
Author(s):  
A. S. Simakov ◽  
M. E. Trifonova ◽  
D. V. Gorlenkov
Keyword(s):  
Electric Arc ◽  
Electric Arc Furnaces ◽  
Current Spectrum ◽  
Arc Furnaces
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